Technical update.

- performance optimizations

Performance optimization

Added video trailer

* several bug fixes and game design improvements
* animation hint (bees) added at "The Bridge" level

numerous bug fixes
a few design and controls improvements

- several game design and controls improvements
- several bugs fixed

- camera system reworked and improved
- several bugs fixed
- other improvements in graphics, music and controls
- added new music track and one new "spirit" animation

We have fixed various bugs and made several design changes to make the game more intuitive.

Minor bug fixing. Fixed app icon.